<template>
    <div class="add-role">
      <header class="add-header">
        <div class="left">
          <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>
          <span>|</span>
          <span>{{roleId?"编辑角色":"添加角色"}}</span>
        </div>
        <div class="right">
          黑马程序员
        </div>
      </header>
      <main class="add-main">
        <div class="step-container">
          <el-steps direction="vertical" :active="activeStep">
            <el-step title="角色信息" />
            <el-step title="权限信息" />
            <el-step title="检查并完成" />
          </el-steps>
        </div>
        <div v-show="activeStep === 1" class="form-container">
            <div class="title">角色信息</div>
            <div class="form">
                <el-form class="form-box" :model="roleForm" ref="roleForm" :rules="roleRules">
                    <el-form-item label="角色名称" prop="roleName">
                      <el-input v-model="roleForm.roleName" />
                    </el-form-item>
                    <el-form-item label="角色描述" prop="remark">
                      <el-input v-model="roleForm.remark" />
                    </el-form-item>
                </el-form>
            </div>
      </div>
      <div v-show="activeStep === 2" class="form-container">
        <div class="title">权限配置</div>
        <div class="form">
            <div class="tree-wrapper">
                <div v-for="item in treeList" :key="item.id" class="tree-item">
                  <div class="tree-title">{{ item.title }}</div>
                  <el-tree
                    ref="tree"
                    :data="item.children"
                    show-checkbox
                    default-expand-all
                    node-key="id"
                    highlight-current
                    :props="{ label: 'title' }"
                  />
                </div>
              </div>
            </div>
    </div>
      <div v-show="activeStep === 3" class="form-container">
        <div class="title">检查并完成</div>
        <div class="form">
            <div class="title">检查并完成</div>
            <div class="form">
              <div class="info">
                <div class="form-item">角色名称：{{ roleForm.roleName }}</div>
                <div class="form-item">角色描述：{{ roleForm.remark }}</div>
                <div class="form-item">角色权限：</div>
                <div class="tree-wrapper">
                  <div v-for="item in treeList" :key="item.id" class="tree-item">
                    <div class="tree-title">{{ item.title }}</div>
                    <el-tree
                      ref="diabledTree"
                      :data="item.children"
                      show-checkbox
                      default-expand-all
                      node-key="id"
                      :highlight-current="false"
                      :props="{ label: 'title',disabled:()=>true}"
                    />
                  </div>
                </div>
              </div>
            </div>
        </div>
      </div>
      </main>
      <footer class="add-footer">
        <div class="btn-container">
            <el-button v-if="activeStep > 1" @click="decreseStep">上一步</el-button>
            <el-button v-if="activeStep < 3" type="primary" @click="increseStep">下一步</el-button>
            <el-button v-if="activeStep === 3" type="primary" @click="confirmAdd">确认添加</el-button>
          </div>
      </footer>
    </div>
  </template>
  
  <script>
  import { getTreeListAPI,addRoleAPI,getRoleDetailAPI,updateRoleAPI} from '@/api/system'
  export default {
    data() {
        return {
        activeStep: 1,
        roleForm: {
            roleName: '',
            remark: '',
            perms:[]
        },
        treeList: [],// 权限树形列表
    roleRules: {
      roleName: [
        { required: true, message: '请输入角色名称', trigger: 'blur' }
      ],
      remark: [
        { required: true, message: '请输入备注信息', trigger: 'blur' }
      ],
    }
        }
    },

    computed: {
      roleId() {
        return this.$route.query.id
        }
  },
    mounted() {
    // 在初始化时候就加载好
    this.getTreeList()
    if (this.$route.query.id) {
    this.getRoleDetail()
  }
    },
    methods: {
      // 回填数据
        async getRoleDetail() {
          const res = await getRoleDetailAPI(this.roleId)
          const { perms, remark, roleId, roleName } = res.data
          // 回填基础表单
          this.roleForm = { perms, remark, roleId, roleName }
          // 回填Tree
          this.$refs.tree.forEach((tree, index) => {
            tree.setCheckedKeys(this.roleForm.perms[index])
          })
        },


        async confirmAdd() {
          if (this.roleId) {
            await updateRoleAPI(this.roleForm)
          } else {
            // 添加
            await addRoleAPI(
              this.roleForm
            )
          }
          this.$message({
            type: 'success',
            message: `${this.roleId ? '编辑' : '新增'}角色成功`
          })
          this.$router.back()
        },
        // 获取功能权限列表
        async getTreeList() {
        const res = await getTreeListAPI()
        this.treeList = res.data
        },
        decreseStep() {
        if (this.activeStep === 1) return
        this.activeStep--
        },
        increseStep() {
        if (this.activeStep === 3) return
        if (this.activeStep === 1) {
            // 当前是角色信息状态，进行表单校验
            this.$refs.roleForm.validate(valid => {
            if (valid) {
        // 校验通过才能进入下一个状态
                this.activeStep++
                     }
                 })
            }else if (this.activeStep === 2) {
            // 当前是权限信息状态
                    this.roleForm.perms = []
                    this.$refs.tree.forEach(tree => {
                    this.roleForm.perms.push(tree.getCheckedKeys())
                     })
                    // 如果长度为零 没有选中任何东西
                    if (this.roleForm.perms.flat().length === 0) {
                    this.$message({
                        type: 'error',
                        message: '请至少选择一个权限点'
                    })
                }else {
                // 进入到下一页
                    this.$refs.diabledTree.forEach((tree, index) => {
                        tree.setCheckedKeys(this.roleForm.perms[index])
                    })
                this.activeStep++
                }
            } 
        // this.activeStep++
        }
    }
  
  }
  </script>
  <style scoped lang="scss">
  .add-role {
    background-color: #f4f6f8;
    height: 100vh;
  
    .add-header {
      display: flex;
      justify-content: space-between;
      padding: 0 20px;
      height: 64px;
      line-height: 64px;
      font-size: 16px;
      font-weight: bold;
      background-color: #fff;
  
      .left {
        span {
          margin-right: 4px;
        }
  
        .arrow {
          cursor: pointer;
        }
      }
  
      .right {
        text-align: right;
      }
    }
  
    .add-main {
      position: fixed;
      top: 64px;
      bottom: 88px;
      width: 100%;
      overflow-y: auto;
      background: #f4f6f8;
      padding: 20px 230px;
      display: flex;
      .step-container {
        height: 400px;
        width: 200px;
      }
      .form-container {
        flex:1;
        background-color: #fff;
        overflow-y: auto;
        .title {
          height: 60px;
          line-height: 60px;
          padding-left: 20px;
        }
        .form {
          margin-bottom: 20px;
          padding: 20px 65px 24px;
          .el-form {
            display: flex;
            flex-wrap: wrap;
          }
          .info{
            font-size:14px;
            color:#666;
            .form-item{
              margin-bottom:20px;
            }
          }
        }
        .form-box{
          width: 600px;
          display: flex;
          flex-direction: column;
        }
      }
    }
  
    .add-footer {
      position: fixed;
      bottom: 0;
      width: 100%;
      padding: 24px 50px;
      color: #000000d9;
      font-size: 14px;
      background: #fff;
      text-align: center;
      z-index: 10001;
    }
    .tree-wrapper {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        .tree-item {
          flex: 1;
          padding: 0px 4px;
          text-align: center;
          .tree-title {
            background: #f5f7fa;
            text-align: center;
            padding: 10px 0;
            margin-bottom: 12px;
          }
        }
      }
  }
  </style>